Cita APA (7th ed.)

(1991). V. 39, № 1. 1991.

Cita Chicago (17th ed.)

V. 39, № 1. 1991, 1991.

Cita MLA (9th ed.)

V. 39, № 1. 1991, 1991.

Atenció: Aquestes cites poden no estar 100% correctes.